Underground coal mine power systems. Proceedings Bureau of Mines Tech. Transfer Seminar 

 - Washington, D.C.  U.S. Bureau of Mines  1982 
 - 88 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CARBON<br/>ENERGIA<br/>MINERIA SUBTERRANEA
<br/><br/><label>Subjects--Geographic Terms: </label><br/>ESTADOS UNIDOS